During my most recent remodeling project, I needed to replace an older baseboard hydronic radiator with a newer Runtal wall mounted radiator (FWIW: Runtal makes a very high quality product right in in MA USA). At the local Home Depot, one of the Homers turned me on to these Shark Bite solderless fittings. These things are For The Win ! They cost a bit more money than regular copper fittings, but they go together as easy as Lego's, and the really cool thing about them is that you can rotate the pipe without them coming loose or leaking, making assembly really easy. If you screw something up, they are also a snap to remove. I would highly recommend that you give these a shot on your next home project, they really makes things a lot easier and faster. I wish somebody had told me about these things sooner.
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